Process for producing wool-like effects on cotton fabrics



UNITED STATES PATENT OFFICE.

GUSTAV ADOLEBOSSHARD, OF Ali/RON, SWITZERLAND, ASSIGNOB TO THE FIRMA.-G. SEERIET, BLEICHE'EEI, FHJALE ARBON, OF ABBON, SWITZERLAND.

PBOCES FQR PRODUCING- WOOL-LIKE ON COTTON FABRICS.

No Drawing.

Toall whom it may concern: Be it known that I, GUSTAV AnoLF Boss- HARD,a citizen of the Republic of Switzerland, residing at Rebenstrasse 44,Arbon, Switzerland, have invented certain new and useful Improvements ina Process for Producing Wool-Like Eifectson Cotton Fabrics; and I dohereby declare the following to be a clear, full, and exact descriptionof nitric acid of from 40-41 analo the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

It is known to impartto cotton a transparent appearance by subjecting itto the action of concentrated mineral acrdsw Mercer already .in- 1844observed that a.

parchment-like appearance could be produced on cotton by the action ofconcentrated sulfuric acid of from 49.5 to 55,5 B. It has also beenascertained that wool-like effects may be produced on cotton fabrics byalternate or consecutive treatment of the cotton fabric with sulfuricacid of from 49 to gelatinous parchment-like effects due to the actionof strong nitric or sulfuric acid on bleached or mercerlzed fabrlcs areconsiderably intensified if use is made inthe place of fthis acid aloneof a. nltrifying or nit-rosulfuric-acid of about 48 B. to 50.5 B. cooledto 0 C. or below 0 C., that is to say a liquid obtained by thebrin ingtogether of (at 15 C.)- and'of-sulfuric acid of from,5558 B. (at 15 C.

) for example, a nit'ro-sulfu'ric Specification of Letters latent.

Patented Dec. 13,1921.

. J Application filed Jilly 9, 1920. Serial No. 394,979.

acid consisting of one part by volume of sulfurlc acidof 565 B. and ,onepart by volume of nitric acid of 40 B. the cotton fabric assumesslightly parchment-like, gelati nous, supple, dense, and wool-likeeffects. a

By printing upon bleached or mercerized cotton fabrics with reserves,such fabrics when treated with a 'nitro-sulfuric acid of the abovementioned concentration enable in parts onlv w ool-like effects to beobtained.

The fact that the process may be carried out with a concentration (of48.3 B. is the reason why softer effects are obtainable than thoseattained by the processes hitherto known. 7 It will be noted that thetreatment of the fabric takes place at low temperatures, as low astwenty degrees below'z'ero centigrade. Also, if the concentration of thenitro-sulfuric acid bebut slightly greater than 483 B. the wool-likeappearance is not so prone to be formed. I i

I claim:

effects on cotton fabrics, the step of treating the fabrics withnitro-s'ulfuric acid of-48.3 'B. cooled down to at least 0 C. p

"2. In a process for producing wool-like I effects on cotton fabrics,the step of treating 1. In a process forproducing-wool-like the fabricwith nitro-sulfuric acid cooled down to a temperature of from 0 C. to-20 C. and obtained b mixing one part by volume of sulfuric acld of 565B. and one part by volume of nitric acid of 40 B.

3. The step in the manufacture of woollike cotton fabrics whichcomprises treating a woven cotton fabric with nitro-sillfurlc acid of aconcentration not gr'eater than 48.3 B. at temperatures belowatmospheric temperatures,

In testimony that I claim the foregoing as my invention, I have signedmy name.

, GUSTAV ADOLIF' BOSSHARD.

